Without seeing exactly what you did it's hard to say. Typically you just copy the whole folder. Network is fine for backup. What you don't ever want to do is to store the files on the network, then open RoboHelp and attempt to edit the project while it's on the network.

Think of your RoboHelp project as you would a small art box that has everything you need to work with your art. If you pick the box up and take it to Grandma's house you are still able to work with your art. RoboHelp projects are the same way. As long as all the files are copied, you should have all you need.